1002011020 has 12 divisors (see below), whose sum is σ = 2104223184. Its totient is φ = 400804400.

The previous prime is 1002011011. The next prime is 1002011027. The reversal of 1002011020 is 201102001.

It is a junction number, because it is equal to n+sod(n) for n = 1002010994 and 1002011012.

It is not an unprimeable number, because it can be changed into a prime (1002011027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25050256 + ... + 25050295.

It is an arithmetic number, because the mean of its divisors is an integer number (175351932).

Almost surely, 2^1002011020 is an apocalyptic number.

1002011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1002011020 is an abundant number, since it is smaller than the sum of its proper divisors (1102212164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1002011020 is a wasteful number, since it uses less digits than its factorization.

1002011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50100560 (or 50100558 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1002011020 is about 31654.5576497287. The cubic root of 1002011020 is about 1000.6698911456.

Adding to 1002011020 its reverse (201102001), we get a palindrome (1203113021).

The spelling of 1002011020 in words is "one billion, two million, eleven thousand, twenty".